HIV is spread by bodily fluids such as blood, breast milk or semen. It gradually weakens the body’s immune system and makes it vulnerable to disease, including ones rarely seen in otherwise healthy people. The surprising emergence of such cases in the 1980s is what tipped off health experts to what became known as the AIDS epidemic.

Proponents say USAID helped curb migration at its root – the same phenomenon the Trump administration wants to stop with policies like mass deportations from the US, ICE raids, and reinforcement at the southern border.